arm+linux 驱动的问题

lao3 2007-5-20 09:09 楼主

最近在弄一个,arm的最底层驱动,但怎么调,都的不到想要的结果,主要是对硬件i/o的读写还不是怎么的理解,望诸位指点,下面是源代码,
目的是,当数据线上出现D2D1D0=011时,地址线的信号A15---A0=0000 1000 0000 0000
源代码:诚盼各位指点,小弟以迷糊了几个星期了

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#define ADC0809_MAJOR 231

#define adc0809_sle (*(volatile unsigned long *)ADC_GPACON)
#define adc0809_sle_data (*(volatile unsigned long *)ADC_GPADATA)
unsigned long ADC_GPACON, ADC_GPADATA;
unsigned long ADC_4051;
devfs_handle_t devfs_adc;
int  adc0809_open(struct inode *, struct file *);
int  adc0809_release(struct inode *, struct file *);
ssize_t adc0809_write(struct file *, const char *, size_t , loff_t *);
static struct file_operations adc0809_fops = {
      open:          adc0809_open,
      write:       adc0809_write,
      release:       adc0809_release,
};
/*
* Open/close code for raw IO.
*/
int adc0809_open(struct inode *inode, struct file *filp)
{
  printk("open ok\n");
  return 0;
}

ssize_t adc0809_write(struct file *filp, const char *buf,
                  size_t size,loff_t *offp)
  {
   char key;                         /int(key)=3;
   if(get_user(key,buf))
   return -EFAULT;
   (*(volatile unsigned char *)ADC_4051)=key;
   printk("addr=0x%x\n",addr);
   udelay(100000);
   return key;
}

//__ioremap
int adc0809_release(struct inode *inode, struct file *filp)
{
      printk("release ok\n");
      return 0;
}

int __init adc0809_init(void)
{
volatile unsigned int bankcon2;

  printk("*********************adc0809_init**************\n");

  ADC_GPACON = (unsigned int)ioremap(0x56000000,4);
  ADC_GPADATA =(unsigned int)ioremap(0x56000004,4);

  ADC_4051 = (unsigned int)ioremap(0x10000800,4);
  bankcon2=(volatile unsigned int)ioremap(0x4800000c,4);
  *(volatile unsigned int*)bankcon2 |= 3<<13;
  /* select NGCS2 */
  adc0809_sle |= 0x2000;
  adc0809_sle_data &= (~0x2000);
/* register char device */
  devfs_adc =
      devfs_register(NULL,"adc0809",DEVFS_FL_DEFAULT,
         ADC0809_MAJOR, 0,
         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
         &adc0809_fops,NULL);
      return 0;
}

int __init adc0809_exit(void)
{
  devfs_unregister(devfs_adc);
  return 0;
}

/*
__initcall(adc0809_init);
*/
module_init(adc0809_init);
module_exit(adc0809_exit);

主要帮我看看那个写函数，是不是能实现我要实现的目的？